axle housing and suspension parts too.
Proper lube of ball joints means lifting the motorhome by a frame member so the
suspension hangs free and then lube the zerks. Don't forget to wipe the zerks clean before
you lube. Otherwise, you will be pushing gritty dirt into the joint. If the motorhome is lifted
for lubrication by driving up on wheel ramps, the ball joints are under enough tension to
inhibit full flow around the entire ball socket. When lifted, it is a good time to check ball
joint wear.
To do this you will need a caliper that will measure the lower ball joint distance between the
tip of the ball stud and tip of the grease fitting below the ball joint while the suspension
hangs free. Then, change the point you are lifting the front end so that you are supporting
the weight of the control arms at each wheel or each lower control arm. Again measure
between the same points on each lower ball joint. The difference between the two
measurements for each should not exceed 3/32 of an inch. Remember, even new ball joints
have play in them. If they didn't, they wouldn't move. If you replace, replace in pairs.
Look at all the rubber washers and bushings for cracks, bulges and wear. The upper and
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